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FastApi Simple Calculator vs User Agent Lookup API

Same instrument, two spec sheets — measured, not claimed.

APIFastApi Simple CalculatorHEALTHY93User Agent Lookup APIHEALTHY96
Uptime · 30d
Uptime · 90d96.1%100%
Uptime · 30d95.0%100%
P50 · ms315426
P95 · ms778764
Authnonenone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

FastApi Simple Calculator vs User Agent Lookup API: common questions

Which is more reliable, FastApi Simple Calculator or User Agent Lookup API?

On our scheduled checks, User Agent Lookup API leads on measured uptime — FastApi Simple Calculator at 96.1% versus User Agent Lookup API at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, FastApi Simple Calculator or User Agent Lookup API?

FastApi Simple Calculator has the lower median latency in our checks — FastApi Simple Calculator responds in 315 ms versus User Agent Lookup API at 426 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do FastApi Simple Calculator and User Agent Lookup API need an API key?

Neither needs a paid key — FastApi Simple Calculator is callable with no signup, and User Agent Lookup API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call FastApi Simple Calculator and User Agent Lookup API from the browser?

Neither sends browser-friendly CORS headers reliably, so call FastApi Simple Calculator and User Agent Lookup API from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are FastApi Simple Calculator and User Agent Lookup API free for commercial use?

FastApi Simple Calculator has unclear commercial terms, and User Agent Lookup API has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.